I have an internal clock which often causes me to wake up at ungodly hours (about 3-15am is a frequent time when I wake up). Sometimes I will turn the radio or listen to a podcast. Occasionally at the weekend I will use my iPhone app to listen to C-SPAN Radio's live feed. They often put on programmes from their "Book TV". If you are not familiar with this - it's worth a look (and listen). The website is http://www.booktv.org/. Programmes are typically between 40 and 90 minutes - and involve an in-depth look at the subject of a non-fiction book. History, Law & Politics are typical subjects.
This Sunday I listened to an interesting programme about the war of 1812 and its significance. [yes, I know, it was a war with Britain!]. The video of the programme is available at
http://www.booktv.org/Program/13044/1812+The+Navys+War.aspx
The book can be purchased here -